New Castle County property tax appeals

Appeal Season is a property tax appeal co-pilot. We are live across Florida and expanding to high-tax counties like New Castle County. We are not there yet, so we cannot check a Delaware assessment today. Leave your email and we will tell you the day we cover New Castle County, and nothing else.

In Delaware, each of the three counties runs its own Board of Assessment Review, which hears annual assessment appeals. Filing windows fall in the winter and spring and differ by county, and all three counties recently completed court ordered reassessments. Each county publishes its own schedule and filing rules.

Source: New Castle County board of assessment review · checked 2026-07-13. We're preparing coverage here and will publish New Castle County's own verified schedule once our review of the county's records is complete.